Origin Of the Universe : Big Bang Theory

Origin Of the Universe is explained by Big Bang Theory. This Model is widely accepted by  most Cosmologists and Astrophysicists. This explains how the formation of Universe took place and how the Time, Space and Matter came into existence from energy.

According to Big Bang Theory :

1.    Around 13.7 billion years ago, Our Universe was infinitesimally       

       small, infinitely hot, infinitely dense known as Singularity.

2.   Singularities are the zones which exist at the core of Black Holes,
      area of intense Gravitational Pressure.At this pressure, matter of 
      Infinite density exist known as Singularity.

3.   Singularity did not appear in Space but Space began inside of the 

      singularity and prior to it , there was no Matter ,Time and Space.

4.   After the existence of Singularity, they started to expand like a very  

      small balloon starts its expansion but no Explosion took place for 

      this Expansion. 

5.   After its initial Expansion, Universe cooled sufficiently which in 

      turn convert the energy into Subatomic Particle like Protons, 

      Electrons and Neutrons.

6.   Protons and Neutrons combined to form the Nuclei of the Atom 

      after few minutes of Big-Bang but Electrons took thousand of years  

      to form an electrically neutral Atom,Atoms were formed by nuclei 

      linking up with free electrons.   

7.   The very first Atom was of Hydrogen along with traces of Helium 

      and Lithium,but the early Universe was dominated by the radiation  

      of Electromagnetic (EM) waves.

8.   It took  200 million years for the Galaxies and Stars to be formed 

     out of pockets of gas Condensing due to gravity present there. 

9.   The Sun of our Universe formed in the same way in the Galaxy 

      known as Milky way and the vast disk of gas and debris swirling 

      around the early Sun gave birth to the planets, including Earth, 

      which is between 4.6 and 4.5 billion years old.

10.  After the formation of million of Galaxies and stars, our Universe 

       is still expanding like balloon according to the Edwin Hubble's law 

       which states that the Doppler velocity of galaxies receding from 

       Earth is proportional to the distance from Earth.